filter
In the context of signal processing and optics, its any device or computational approach for removing certain components from the signal (e.g., using an optical filter to detect only a desired spectral waveband).
See also: excitation filter , emission filter , interference filter , narrow-bandpass filter , bandpass filter , broad-bandpass filter , color conversion filter , color filter , heat filter , longpass filter , neutral density filter , polarizer , shortpass filter
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